Back 2007, veteran TV writer Terence Winter first met with Martin Scorsese to talk about creating what became the HBO series "Boardwalk Empire," about a month before Leonardo DiCaprio and Warner Bros. snatched the rights to Jordan Belfort's memoir "The Wolf of Wall Street."

Who better than rock mag Rolling Stone to give ace movie ranker "Sight & Sound" (which recently listed the top 50 documentaries of all time) a run for its money? Rolling Stone has ranked the 40 greatest rock documentaries (of all time, natch). What's number one?